Found this list online here. I think this is a great list that every serious relationship (marriage or otherwise) should follow. If you find you’re starting to fail on some of these, then start working harder!

1. Go to bed together. Going to bed at the same time shows that you want to experience the closeness that can only be found in bed.
2. Have shared interests. Sharing your interests & ideas with life partner is one of the activities of
   happy Couples. Stay together find things that they both enjoy doing.
3. Hold hands. Holding hands shows that you are still in love. That you cherish just touching your
   partner and need that connection whether you are walking through a store or just sitting on the couch.
4. Focus on the positive. Remaining positive is one of the important secrets of happy married couples.. Everyone has something that they dislike about their spouse. But couples that are happy focus more on the positive things about their spouse than the negative. They look not at the few things their spouse does wrong but all of the things that they do right.
5. Forgive. One of the hardest things to do is to forgive. But couples that are happily married forgive freely forgive each other. Not only do they forgive each other, but they also do not bring up past mistakes. Once the misdeed is forgiven it is also forgotten.
6. Say I love you. “I love you,” is a very important sentence for happy married couples. It makes couples more intimate by expressing these words.
7. Communicate. Communicate to stay connected with spouse. Communication is a secret to remain a happily married couple for years. Couples who can talk to each other stay together. Being able to communicate means that you can share the good things and discuss problems without getting angry. It also means that you probably talk to each other throughout the day. My husband and I communicate through email and phone calls during the day then always take time to talk to each other every evening.
8. Compromise. Sometimes you will disagree and thats when compromising comes into play. If both spouses learn to give then both will be happy.
9. Share affection. Giving affection through hugs, kisses, and touching, is important. It creates a bond and keeps the romantic feelings alive.
10. Show respect. Each spouse needs to respect the other and their desires. Mutual respect means that consideration is taken for the others feelings.